So you are saying you can use dope and not get sick for 16 hours ? hard to believe..................since most people do a shot or a bag and in a couple hours they need another. they may not get full blown withdrawals for a few more hours ,but i think once u have a habit dope is a pretty short acting drug, Why is it though the more you do at one time longer you seem to stay high , plus i think that shooters dont stay high as long as sniffers do , so they may get that rush but after that their high fades quicker i think........